CN209949677U - Quick-mounting-dismounting vacuum brazing avionics chassis - Google Patents

Abstract

The utility model provides a fast loading and unloading vacuum brazing avionics machine case, quick-witted incasement portion fixed mounting a plurality of functional module respectively is equipped with a locker about on each functional module, and the guide rail inslot that sets up on guide rail board and the bottom plate that functional module fixed on quick-witted case box through controlling two lockers. The utility model can realize the quick assembly and disassembly of the module in the case without auxiliary tools; the high aluminum alloy material of coefficient of heat conductivity of functional module wraps cold drawing apron structure, heat conduction rubber pad can effectively scatter the heat that the device produced on the module, and thermal environment operational reliability is high, and the use of flexbile plate reduces the whole weight of wire connection damping product and also makes things convenient for later stage electricity fitting assembly simultaneously, presss from both sides the setting of tight process screw, clamping process window, welding seam position and can improve the durable vibration intensity of vacuum brazing machine case box.

Description

Quick-mounting-dismounting vacuum brazing avionics chassis

Technical Field

The invention relates to the field of combined design of structures and circuits, in particular to a vacuum brazing avionic chassis.

Background

The internal module of the traditional avionic chassis adopts a structural form that a screwdriver is used for fastening a common wedge-shaped block locker, so that quick disassembly and assembly cannot be realized, and the maintenance is inconvenient; when the heat generating power of functional module components in the traditional avionic chassis exceeds 100W, a fan or an airplane needs to be cooled by controlling wind, and an air duct and related features need to be arranged, so that the overall weight of a product and the size of an onboard installation space can be increased; vacuum brazing welds are generally flat to ensure workability and stress concentration considerations are low, failing to meet strength requirements over long periods of time (40 hours per axial direction) at high endurance vibration (average magnitude of 18.68 g). A new avionic chassis is urgently needed, which can meet the problems of quick assembly and disassembly of internal functional modules, quick and natural heat dissipation of internal functional module components and parts and welding line setting according to actual conditions to meet the requirement of high-magnitude long-time durable vibration strength.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the vacuum brazing avionic chassis with the internal modules capable of being rapidly assembled and disassembled, so that the requirements of high-vibration-level long-time durable vibration strength, natural rapid heat dissipation under high heating power, weight reduction of an environment-control facility, space reduction and rapid disassembly and assembly of the internal functional modules are met.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a plurality of functional modules are fixedly installed inside the case, each functional module is provided with a locker on the left and right, and the functional modules are fixed in guide rail plates on a case body and guide rail grooves formed in a bottom plate through the left locker and the right locker.

The thickness H required by the locker after locking is x, the width of a guide rail groove required by a functional module arranged on a case body of the case is y, the difference value between x and y is the thickness of a cold plate at the position of the functional module for fixing the locker, the handle is rotated by taking a pin shaft of the locker as a center to enable the handle and the slide rod on the locker to be in a parallel state, each sliding block is in a free state at the moment, the locker is assembled with the functional module through a threaded hole on the slide rod, then the functional module moves downwards along the guide rail groove arranged on the guide rail plate and the bottom plate on the case body, when a rectangular connector at the bottom of the functional module and a rectangular connector seat c on a mother plate are oppositely inserted in place, the handle is rotated to enable the handle to rotate anticlockwise around the pin shaft, the handle extrudes the square sliding block in the rotating process to push the square sliding block to move downwards along the slide rod, the sliding block 1, the screw is screwed into the threaded hole on the end face of the sliding rod, the internal thread of the square threaded block and the external thread of the screw are screwed, the gasket provides pretightening force, when the locking device is locked, the upper surfaces of the sliding block 2 and the sliding block 4 are on the same plane, the distance between the upper surface of the cold plate and the lower surface of the cold plate for assembling and assembling the locker of the functional module is equal to the width of the guide rail groove of the case body, the screwing length of the screw and the sliding rod and the relative position of the square threaded block on the sliding rod are adjusted, namely the space height of the locker is adapted when the locking device is in a locking state, the sliding blocks are tightly attached and extruded together, after the locking, the anti-skid block contacted with the handle applies a reaction force to the handle to enable the handle to rotate clockwise and loosen, but the pin shaft is positioned on the central line of the sliding rod, namely, the locker has the functions of self-locking and anti-loosening.

When the module is disassembled, the handle of the locker is rotated anticlockwise, each sliding block moves towards the handle along the sliding rod to be changed into a free state, the tail end of the handle is contacted with a supporting plane on the case body of the case, the handle is continuously rotated by taking the contact point as a fulcrum, the sliding rod is driven to move upwards, the sliding rod and the functional module are fixedly connected together through the screw, the functional module also moves upwards, and when the rectangular connector at the bottom of the functional module is completely loosened from the rectangular connector seat c on the motherboard, the handle can be pulled upwards to drive the whole functional module to be disassembled from the case body.

A plurality of components are welded on a printed board of the functional module, a plurality of bosses are arranged on a cold plate at the positions attached to the components, the bosses on the cold plate are arranged in one-to-one correspondence with the positions of the components on the printed board, the distance between each boss and the corresponding component is 0.5mm, a heat-conducting rubber pad with the thickness of 1mm is adhered to the surface of each component, the heat-conducting rubber pad is extruded to be 0.5mm after being assembled in place, the components and the bosses are respectively attached to two sides of the heat-conducting rubber pad, and the components on the back of the printed board are attached to the bosses on the cold cover plate through the heat;

the materials of the cold plate and the cold cover plate are aluminum alloy 6061-T6 GB/T3880-2006 with high heat conductivity coefficient.

The front panel of the case is provided with a plurality of circular connectors, the circular connectors are welded on the front panel printed board through welding pins, 1 spare rectangular connector and the plurality of rectangular connectors are welded on a mother board, and the mother board and the front panel printed board are integrated into a whole through a multilayer flexible board.

And at the position of the mounting lug of the case body, the end of the welding line is positioned at the position of the case body, the distance between the welding line and the end of the case body is 50mm, the welding line is upwards adjusted by 15mm, and a transition circular arc is arranged at the junction of the mounting lug and the vertical surface of the case body.

The invention has the beneficial effects that:

firstly, the quick assembly and disassembly of the module in the case can be realized, and an auxiliary tool is not needed;

secondly, the functional module adopts a fully-wrapped cold plate cover plate structure made of aluminum alloy materials with high heat conductivity coefficient and a heat-conducting rubber pad, so that heat generated by devices on the module can be effectively dispersed, and the working reliability of the module in a hot environment is high;

thirdly, the use of the flexible plate reduces the whole weight of the vibration reduction product connected by a lead and is convenient for later electric assembly;

fourthly, the arrangement of the clamping process screw, the clamping process window and the welding seam position can improve the durable vibration strength of the vacuum brazing case body.

Drawings

Fig. 1 is a three-dimensional exploded view of an interior module quick-load, quick-release vacuum brazed avionics chassis of the present invention.

Fig. 2 is a schematic view of the guide rail groove of the chassis box body.

Fig. 3 is an external view of the module C of the present invention.

FIG. 4 is an external view of the right fastener in a released state of the present invention.

FIG. 5 is an exploded view of the right lock of the present invention in a locked condition.

FIG. 6 is a top view of the right lock of the present invention in a locked state.

FIG. 7 is a front view showing the locking state of the right lock of the present invention.

Fig. 8 is a schematic view of the module C (4) of the present invention operating with the right fastener removed.

Fig. 9 is an exploded view of the heat dissipating components of module C (4) of the present invention.

Fig. 10 is a view of a flexible sheet arrangement of the present invention.

FIG. 11 is a view of a vacuum braze weld setup of the present invention.

FIG. 12 is a screw set-up view of the vacuum brazing clamping process of the present invention.

Wherein, 1-case box body, 2-module A, 3-function module B, 4-function module C, 5-function module D, 6-function module E, 7-right locker, 8-upper cover plate, 9-left locker, 10-upper guide rail plate, 11-guide rail groove, 12-bottom plate, 13-handle, 14-pin shaft, 15-square slide block, 16-slide block 1, 17-slide block 2, 18-slide bar, 19-slide block 3, 20-slide block 4, 21-slide block 5, 22-square thread block, 23-gasket, 24-screw, 25-end face thread hole, 26-thread hole 1, 27-thread hole 2, 28-rectangular connector seat a, 29-rectangular connector seat B, 30-rectangular connector seat C, 31-spare rectangular connector, 32-rectangular connector seat d, 33-rectangular connector seat e, 34-front panel printed board, 35-flexible board, 36-mother board, 37-front panel, 38-dead point, 39-center line, 40-thickness H, 41-support plane, 42-cold cover plate, 43-component, 44-printed board, 45-boss, 46-cold plate, 47-box fin, 48-cold plate fin, 49-circular connector a, 50-circular connector b, 51-circular connector c, 52-circular connector d, 53-circular connector e, 54-weld a, 55-back frame, 56-clamping process window, 57-weld b, 58-weld c, 59-front frame, 60-welding seam d, 61-clamping process screw, 62-mounting lug and 63-transition arc.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

The invention belongs to the field of combined design of structures and circuits, and provides a vacuum brazing avionic chassis with an internal module capable of being quickly assembled and disassembled to meet the requirements of quick assembly and disassembly of the internal module, quick dispersion of heat of devices on the internal module to improve the reliability of thermal work, reduction of wire connection by a flexible plate to reduce the overall weight of a product and facilitate later-stage electric fitting assembly, a plurality of welding clamping process screws and clamping process windows are arranged to enable a strip-shaped brazing filler metal to be effectively infiltrated and diffused on a weld joint after being melted at high temperature in a high-temperature vacuum furnace to improve the welding quality, a vacuum brazing joint surface is arranged at a position 15mm away from a stress concentration position of a chassis mounting lug, and the strength redundancy of an on-machine vibration.

Referring to fig. 1 to 12, an internal module fast-loading and fast-unloading vacuum brazing avionic chassis realizes fast assembly and disassembly of internal functional modules through a fast-loading and fast-unloading locker; the heat generated by the components on the functional module in the case forms a quick heat dissipation channel through the heat conduction rubber pad, the high-heat-conductivity-coefficient aluminum alloy material full-wrapping cold plate, the case body and the case surface heat dissipation fins, so that the heat generated by the components on the functional module can be quickly dispersed in a natural state, the working temperature of the components is kept in a proper range on the premise of no need of setting an environment control facility for reducing weight and reducing required space, and the working reliability is improved; the printed board welded behind the connector socket on the front panel is integrated with the motherboard through the flexible board, compared with the traditional form, the wire welding between the front panel connector socket and the motherboard can be omitted, the weight is reduced, and meanwhile, the later-stage electric assembly is facilitated, and the manufacturing period is shortened; the brazing joint surface of the vacuum brazing box body avoids stress concentration of the mounting lug through the sectional unequal-height arrangement to prevent a durable vibration welding seam from cracking, and a plurality of welding clamping process screws and clamping process windows (the clamping process windows are not arranged on the traditional case) are arranged, so that the strip-shaped brazing filler metal forms effective infiltration and diffusion on the welding seam after being melted at high temperature in a vacuum furnace, and the strength of the vacuum brazing welding seam is improved.

The internal module fast loading and unloading vacuum brazing avionic chassis has weight control on the chassis, the heat generating power of devices on the internal functional module reaches 128W, the internal module needs to be fast cooled to keep the working temperature within the proper range of the devices, the vibration magnitude is large, the durable vibration average acceleration reaches 18.68g, the internal module needs to be fast loaded and unloaded to facilitate the maintenance of an external field, and the internal module of the traditional chassis structure adopts a structure form that a screwdriver is used for fastening a common wedge block locker to meet the requirement.

A three-dimensional explosion diagram of an internal module fast loading and unloading vacuum brazing avionic chassis is shown in figure 1, 5 fixed functional modules are installed inside, namely a functional module A (2), a functional module B (3), a functional module C (4), a functional module D (5) and a functional module E (6), each functional module is provided with a left locker (9) and a right locker (7), and the functional modules are fixed in guide rail grooves (11) formed in a guide rail plate (10) and a bottom plate (12) on a chassis box body through the left locker (9) and the right locker (7).

The quick assembling and disassembling process of the functional module in the chassis box takes the functional module C (4) as an example, during assembly, the working principle of the locker takes a right locker (7) as an example, the thickness H (40) required by the right locker (7) after locking is x, the width of a guide rail groove (11) required by the functional module arranged on the chassis box is y, the difference value between x and y is the thickness of a cold plate at the position where the locker is fixed on the functional module, a handle (13) is rotated by taking a pin shaft (14) of the right locker (7) as a center to enable a handle (13) on the locker and a sliding rod (18) to be in a parallel state, at the moment, each sliding block is in a free state, the right locker (7) is assembled with the functional module C (4) through threaded holes (26 and 27) on the sliding rod (18) on the right locker (7), and then the functional module C (4) moves downwards along the guide rail groove (11) arranged on a guide rail plate (10) and a bottom plate (12) on the chassis box (1), when the rectangular connector (28) at the bottom of the functional module and the rectangular connector seat c (30) on the motherboard (36) are oppositely inserted in place, the handle (13) is rotated to enable the handle (13) to rotate anticlockwise around the pin shaft (14), the handle (13) extrudes the square sliding block (15) in the rotating process, the square sliding block (15) is pushed to move downwards along the sliding rod (18), the sliding block (1) (16), the sliding block (2) (17), the sliding block (3) (19), the sliding block (4) (20) and the sliding block (5) (21) move relatively along the sliding rod (18), a screw (24) is screwed into a threaded hole (25) on the end face of the sliding rod (18), the internal thread of the square thread block (22) and the external thread of the screw (24) are screwed, a gasket (23) provides pre-tightening force, when the locking is carried out, the upper surfaces of the sliding block (2) (17) and the sliding block (4) (22) are on the same plane, and the distance from the lower surface, the screwing length of the adjusting screw (24) and the sliding rod (18) and the relative position of the square thread block (22) on the sliding rod (18) are adjusted, namely the space height of the locker in a locking state is adapted, the sliding block is also adapted to guide rail grooves of chassis boxes with different sizes, after the locking, the sliding blocks can be tightly attached and extruded together, the anti-skidding block (15) contacted with the handle (13) applies a reaction force to the handle (13) to drive the handle to rotate clockwise to be loosened, but the pin shaft (14) is positioned on the central line (39) of the sliding rod (18), the force direction just passes through the pin shaft (14), and the contact position of the anti-skidding block and the handle becomes a dead point (38) in structural kinematics, so that the locker can not be loosened, namely the locker has a.

When the module is disassembled, firstly, the handle (13) of the locking device is rotated anticlockwise, each sliding block moves towards the handle (13) along the sliding rod (18) to be changed into a free state, the tail end of the handle (13) is contacted with the supporting plane (41) on the case body (1), the handle (13) is continuously rotated by taking the contact point as a fulcrum, the sliding rod (18) is driven to move upwards, the sliding rod (18) and the functional module C (4) are fixedly connected together through a screw, the functional module C (4) also moves upwards, and when the rectangular connector (28) at the bottom of the functional module C (4) is completely loosened from the rectangular connector seat C (30) on the motherboard (36), the handle (13) can be pulled upwards to drive the whole functional module C (4) to be disassembled from the case body (1).

Taking a functional module C (4) as an example, a plurality of components (43) are welded on a printed board (44), a plurality of bosses (45) are arranged at the positions, which are jointed with the components (43), on a cold board (46), the bosses (45) on the cold board (46) are arranged in one-to-one correspondence with the positions of the components on the printed board (44), the distance between the bosses (45) and the components (43) is 0.5mm, a heat-conducting rubber pad with the thickness of 1mm is pasted on the surfaces of the components during assembly, after the heat-conducting rubber pad is extruded to be 0.5mm after the components are assembled in place, the components and the bosses are respectively jointed at two sides of the heat-conducting rubber pad, and the components on the back surface of the printed board are jointed with the bosses on a cold cover plate (; the materials of the cold plate (46) and the cold cover plate (42) adopt aluminum alloy 6061-T6 GB/T3880-2006 with high heat conductivity, and the conduction route of heat generated by the operation of the component (43) is as follows: a radiation path of heat generated by the operation of heat-conducting rubber pads, a cold plate (46), a case body (1), external surface fins (47), external air and components: the heat is effectively dispersed by the heat-conducting rubber pads, namely the cold plate (46), the upper fins (48) of the cold cover plate (42), namely air in the case body (1), namely the case body (1) and outside air, so that the working reliability in a hot environment is improved.

The front panel (37) of the chassis is welded on a front panel printed board (34) through welding pins by a circular connector a (49), a circular connector b (50), a circular connector c (51), a circular connector d (52) and a circular connector e (53), the rectangular connector a (28), the rectangular connector b (29), the rectangular connector c (30), a spare rectangular connector (31), the rectangular connector d (32) and the rectangular connector e (33) are welded on a motherboard (36), the motherboard (36) and the front panel printed board (34) are integrated through a multilayer flexible board (35), and communication among modules, the rectangular connector seat, the motherboard, the flexible board, the front panel printed board, the circular connector and other electronic equipment on the chassis is realized, the use of the flexible plate reduces the wire and connects the welding and connect and lighten the whole weight of the product and also facilitates the later-stage electric fitting assembly.

The principle of aluminum alloy vacuum brazing is that brazing filler metal (used as filling metal) is placed in a gap of a weldment in a high vacuum environment, the brazing filler metal is molten when a vacuum brazing furnace is heated to the melting temperature of the brazing filler metal, the melting point of the brazing filler metal is lower than that of the metal of the weldment, the brazing filler metal is molten into liquid state at the moment, a base metal of the weldment keeps solid state, and the liquid brazing filler metal wets, permeates, flows, fills and spreads in the gap of the weldment or on the surface of the weldment to interact with the base metal of the weldment, and is cooled and solidified to form a firm joint. In the welding process, in order to form effective infiltration and diffusion at the welding seams a (54), b (57), c (58) and d (60) to ensure the strength of the welding seams, 3 clamping process screws (61) are respectively arranged on each welding seam; in order to provide auxiliary clamping force by using a semi-I-shaped clamp or a C-shaped clamp during vacuum brazing, a clamping process window (56) is additionally arranged on a rear frame (55), in order to further improve the safety margin of a vacuum brazing case body, the position of a welding line is kept away from the position of the maximum vibration response stress, namely the position of an installation lug (62), the ends of a welding line b (57) and a welding line C (58) are positioned in the case body and are upwards adjusted by 15mm from the welding line in the position 50mm away from the end of the case body, a transition arc (63) is arranged at the junction of the installation lug (62) and the vertical surface of the case body, the local stress concentration is avoided, and the durable vibration strength of.

Claims (6)

1. A fast loading and unloading vacuum brazing avionics chassis is characterized in that:

the quick-loading and unloading vacuum brazing avionic case is characterized in that a plurality of functional modules are fixedly installed inside the case, each functional module is provided with a locker on the left and right, and the functional modules are fixed in guide rail plates on a case body and guide rail grooves formed in a bottom plate through the left locker and the right locker.

2. A quick-access vacuum-brazed avionics chassis according to claim 1, in which:

the thickness H required by the locker after locking is x, the width of a guide rail groove required by a functional module arranged on a case body of the case is y, the difference value between x and y is the thickness of a cold plate at the position of the functional module for fixing the locker, a handle is rotated by taking a pin shaft of the locker as a center to enable the handle and a slide rod on the locker to be in a parallel state, each sliding block is in a free state at the moment, the locker is assembled with the functional module through a threaded hole on the slide rod, then the functional module moves downwards along the guide rail groove arranged on a guide rail plate and a bottom plate on the case body, when a rectangular connector at the bottom of the functional module and a rectangular connector seat c on a mother plate are oppositely inserted in place, the handle is rotated to enable the handle to rotate anticlockwise around the pin shaft, the handle extrudes a square sliding block in the rotating process to push the square sliding block to move downwards along the slide rod, the sliding block I, the screw is screwed into the threaded hole on the end face of the sliding rod, the inner thread of the square threaded block and the outer thread of the screw are screwed, the gasket provides pretightening force, when the locking device is locked, the upper surfaces of the second sliding block and the fourth sliding block are on the same plane, the distance between the upper surface of the cold plate of the functional module assembling locker and the lower surface of the cold plate is equal to the width of the guide rail groove of the case body, the screwing length of the screw and the sliding rod and the relative position of the square threaded block on the sliding rod are adjusted, namely the space height when the locking device is in a locking state is adapted, the sliding blocks are tightly pressed together, after the locking device is locked, the anti-skid block contacted with the handle applies a reaction force to the handle to enable the handle to rotate clockwise to be loosened, but the pin shaft is positioned on the central line of the sliding rod, the force direction just, namely, the locker has the functions of self-locking and anti-loosening;

when the module is disassembled, the handle of the locker is rotated anticlockwise, each sliding block moves towards the handle along the sliding rod to be changed into a free state, the tail end of the handle is contacted with a supporting plane on the case body of the case, the handle is continuously rotated by taking the contact point as a fulcrum, the sliding rod is driven to move upwards, the sliding rod and the functional module are fixedly connected together through the screw, the functional module also moves upwards, and when the rectangular connector at the bottom of the functional module is completely loosened from the rectangular connector seat c on the motherboard, the handle can be pulled upwards to drive the whole functional module to be disassembled from the case body.

3. A quick-access vacuum-brazed avionics chassis according to claim 1, in which:

the printed board of the functional module is welded with a plurality of components, a plurality of bosses are arranged on the cold plate and at the positions of the components attached to the cold plate, the bosses on the cold plate and the positions of the components on the printed board are arranged in a one-to-one correspondence mode, the distance between each boss and each component is 0.5mm, a heat-conducting rubber pad with the thickness of 1mm is attached to the surface of each component, after the heat-conducting rubber pad is assembled in place, the heat-conducting rubber pad is extruded to be 0.5mm, the components and the bosses are attached to the two sides of the heat-conducting rubber pad respectively, and the components on the back of the printed.

4. A fast-loading and fast-unloading vacuum-brazed avionics chassis according to claim 2, characterized in that:

the materials of the cold plate and the cold cover plate are aluminum alloy 6061-T6 GB/T3880-2006 with high heat conductivity coefficient.

5. A quick-access vacuum-brazed avionics chassis according to claim 1, in which:

the front panel of the case is provided with a plurality of circular connectors, the circular connectors are welded on the front panel printed board through welding pins, 1 spare rectangular connector and the plurality of rectangular connectors are welded on a mother board, and the mother board and the front panel printed board are integrated into a whole through a multilayer flexible board.

6. A quick-access vacuum-brazed avionics chassis according to claim 1, in which:

and at the position of the mounting lug of the case body, the end of the welding line is positioned at the position of the case body, the distance between the welding line and the end of the case body is 50mm, the welding line is upwards adjusted by 15mm, and a transition circular arc is arranged at the junction of the mounting lug and the vertical surface of the case body.

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